Difference between value type and reference type

The method for passing internal values is different:

The Value Type copies its own value and passes it to other function operations. No matter how the copied value is changed, its own value will not change.

The reference type is to pass its memory address to other function operations. The operation is to reference the type value itself, so the value is changed by the function.

For example
Int A = 1;
Int B =;
B ++;
At this time, B is 2, and A is still 1.
Let's look at the reference type again. For example, there is a user type
User U1 = new user () {name = "Zhang San "};
User U2 = U1;
U2.name = "Li Si ";
At this time, the names of U2 and U1 are Li Si, because when U2 is U1, u1 and U2 will point to the address in the same memory. Changing U2 is equivalent to changing u1,

 

Difference between value type and reference type